Easter Eggs

Calendar Man's Secret Message

This Easter Egg was discovered three years after the game's release, and hinted at by a YouTube account that may have been created by RockSteady

To view this cryptic message, you must set your system's internal clock back to December 13th, 2004 (The date studio Rocksteady was formed). Visiting Calendar Man in the Courthouse will provide the following message by the holiday-obsessed villain:

"Do you remember my early work? Flawed, but it showed promise. The end of days is coming. I was there at your beginning, and I will be there at your end."

Courtesy of Batman Arkham Videos

This appears to indicate the final chapter of the Arkham Batman is at hand, and Calendar Man may yet have a role to play in the conclusion of the series.

Harley Quinn's Revenge - Harley's not Pregnant?

When playing through the Batman portion of the Harley Quinn's Revenge DLC for Batman: Arkham City you can come across a crib that's surrounded by Pregnancy Tests that are negative. This could mean that the earlier Easter Egg showing that Harley was pregnant could be false or it could just be another item to keep us Batman fans guessing.

Big Head Mode

Bring out the Cryptographic Sequencer and rotate the right thumbstick to the right, and the left thumbstick to the left while holding the bumpers and triggers to give Batman, and everyone in the game a big head.

The Return of Scarecrow and the Secret Ship Hatch

Follow these videos to find Scarecrow's mask and hints toward his future plans for Gotham City. You need to go to the boat closest to the ocean, land on the hidden hatch and hack it. Once you do this you can go inside and take a look around to see what Dr. Crane aka Scarecrow has been up to. Also, his mask can be found on top of the drawbridge just to the right of the boat's secret hatch!

Tick Tock! Find the Croc!

In the sewers underneath Arkham City, you can have a brief encounter with Killer Croc! Watch the video for more!; This can only be done after the Ninja from Ra's Al Ghul encounter when you're running through the sewers.

Secret Radio Messages

Throughout the game use the Crypographic Sequencer to search the radio waves. there are a few stations that give off random numbers followed by a chime. These numbers can be decoded with a simple cipher by matching them up to letters in the alphabet (A=1, B=2, C=3).

Station 700.00/500.00

STATION; 200.00/500.00

Decoded with the keyword SCARECROW, it reads "FEAR WILL TEAR GOTHAM CITY TO SHREDS".

Harley's Revenge

After you beat the game, head back to Joker's Fun House, beat up the thugs, and then grapple up to Joker's old office. Walk to the back where Harley's nurse outfit from the first game is. Zoom in and look at the ground to the left of the costume to see a positive pregnancy test. During the end credits, Harley can be heard singing a lullaby. "Momma's gonna kill for you the whole damn world..."

Gotham City Disaster Map

Remember that last symbol Azrael left you after he left told you about the whole Gotham will burn and so will you" thing? Well, also remember how that exact type of symbol was used to locate him? So I did some research and I found something that you might like, now if you go and compare that symbol with this official map of gotham (http://upload.wikimedia.org/wikipedia/en/a/ae/Gotham_City_map.jpg)from DC's No Man's Land then you will notice that a few locations can be targeted PERFECTLY. Image for comparison: (http://i1143.photobucket.com/albums/n626/yourejustafreak/bac.png);First off #42 the Cathedral Square, then a little bit up north you can find #31 The Reservoir, #32 the Wayne Botanical Garden(Poison Ivy!?) #45 Monolith Square, and the last one could either be #46 the C Building or #54 the South Complex! So obviously each one will be infected with a villain( already found one!) So I ask you this, Batman: Fall Of Gotham? I say yes.

Appearance of Black Mask

After you find your way out of that chair in the opening sequence, and are headed to line A, take a peek to your right hand side before you hit the gates. Black Mask is being subdued by 6 Tyger Gaurds with batons and he does not seem to be very happy about it.

Scarecrow's fear gas containers and Henchmen

In the second Riddler room at the back you will find a fence with containers behind them that have Scarecrow's symbol on them. Mabye Riddler and Scarecrow team up?

Hencemen that seem to be affiliated with Scarecrow can also be seen during Protocol 10 on top of the Gotham Casino building and Krank Co. Toys building. They are wearing a burlap sack over their faces and have on clothing similar to Scarecrow's. Perhaps they were doing Scarecrow's bidding while he stayed low.

Poison Ivy's Revenge

Returning to Poison Ivy's Lair as Catwoman after the destruction of Wonder Tower, there is two Arkham City inmates and a Tyger Guard kneeling before her. The three manipulated guys talks about loving her, while Ivy says they will do everything for her.

Afterwards there is a possibility to talk to her. Finding out Hugo Strange killed her last plant, she gets angry and talks about killing Strange, destroy Gotham and that the world will fear her.

Possible hint for the upcoming sequel?

Azrael's first appearance

When you walk in as Bruce Wayne into Arkham City, you can see Azrael on top of a building watching you. This could mean that Azrael is fully aware that Bruce Wayne is Batman. If you zoom in on him he will disappear in a cloud of smoke.

Calendar Man disappearance

The Calendar man is located in a cell in the Solomon Wayne Courthouse basement. Once you've completed all the dates with Calendar Man go away and come back and you'll see that he's gone and left a Two-Face thug hanging in the cell.

Possible New Enemy DLC or for Arkham World

When you go to the room you fought Mr.Freeze in, scan the walls for papers. When you find a bunch of papers use your remote control batarang and slow it down to read the legible stuff on the papers.(There are several papers on walls so you may need to attempt more than once). You will find an Arkham City bio for a "certain villain" (Prometheus) that will prove a great enemy for Batman potentially.

Mr. Freeze Has a Sense of Humor

After completing the side mission, "Heart of Ice," return to the GCPD after Mr. Freeze has left. Inside the forensics lab, walk up to Freeze's computer and zoom in on the keyboard. Instead of letters, each of the main keys is a different emoticon ranging from silly faces to happy faces.

City in a Puddle

In the Gladiator Pit of the Museum, go under the middle gate and then break through the window on the right side of the room with the leaking vault door. In the back corner of the next room is a puddle. Zoom in on the puddle to see the reflection of a cityscape. Some have claimed it could be a hint to Bludhaven, Gotham City, Metropolis, or Keystone.

Harley's Baby (Harley Quinn's Revenge DLC)

The Ventriloquist's puppet is baby Joker!! Around the same area you find the pile of pregnencey test in the Harley Quinn's Revenge DLC Scareface is in the crib painted as babby Joker.

While playing as Batman, in Harley's Revenge, there is a Cadmus Labs poster after you zipline over the watered path. The poster can be seen to the right before you go up the stairs.

Deadshot Hits the Mark

After you find your way out of that chair in the opening sequence, and are headed to line A, You are told to step past two prisoners. As soon as you proceed, a prisoner steps out. Pointing his hand in the shape of a gun, he yells "Bruce Wayne! You're on my list, BANG!". This prisoner is the Villain Deadshot, the character's signature is to practice lining up his kill shots before hand, to ensure he never misses.